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  <script>
    var a = [1,2,2,2,2,3,'true','true',true,true,false,false, undefined,undefined, null,null,'a', 'a', NaN, NaN, {a: 1},{a: 1}]
    var b = {name: 1}
    // console.log(bySet(a)) // 对象无法去重
    // console.log(byindexOf(a)) // NaN, 对象无法去重
    // console.log(byIncludes(a)) // 对象无法去重
    // console.log(bySort(a)) // NaN, 对象无法去重
    // console.log(byhasOwnProperty(a))  
    // console.log(byFIlter(a)) // 对象无法去重
    // console.log(byReduce(a)) // 对象无法去重
    // console.log(byMap(a)) // 对象无法去重
    // console.log(bytostring(b))
    console.log(isPalindromic('nooN'))
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